68results about How to "High longitudinal tensile strength" patented technology

The invention relates to a method for preparation of a polyolefin microporous membrane by a wet process. According to the method, polyolefin resin, an antioxidant and liquid paraffin are adopted as raw materials for preparation of the microporous membrane through a thermally induced phase separation method. Employment of the preparation method provided in the invention can effectively prevent thermal oxidative degradation and carbonization phenomena in a high temperature processing process of polyolefin resin. The antioxidant and the polyolefin resin are mixed and dispersed more uniformly, and the antioxidant can be removed during liquid paraffin extraction, so that the pure and high performance polyolefin microporous membrane can be obtained.

The invention relates to a steel structure building beam or a steel structure pillar node interface, which is used for connecting convergent nodes of a steel structure building beam or a steel structure pillar and overcoming the shortages of toilsome assembly, bad accuracy, low connection strength, and the like in the existing connection mode. The steel structure building beam or pillar node interface is composed of joints of the end part of the beam or the pillar and joint seats converged on the node, wherein the joints lack a half at the end part in the horizontal direction to form a ladder shape. The shape and the size of the joint seats are the same with that of the joints. A connection insertion tenon is arranged on a mutual faying surface formed when the joint is butt jointed with the joint seat, the connection insertion tenon is vertical to the faying surface and a fastening structure for preventing the joint and the joint seat from horizontally separating is arranged at the faying position of the joint and the joint seat. According to invention, the steel structure building beam or pillar node interface has the beneficial effects that the faying mode bearing of the interface has large bearing capacity; the steel structure building beam-pillar node interface has high longitudinal tensile strength, is provided with the fastening member for preventing the joint and the joint seat from horizontally separating so that the connection of the node of the beam and the pillar has multi-directional higher anti-breaking strength, has a simple structure, and is convenient to manufacture and install; and with the adoption of the steel structure building beam or pillar node interface, the conditions are created for modularization, standardization and serialization of steel structure housing construction.

The invention provides copper alloy with excellent tensile strength and a copper alloy pipe prepared from the copper alloy. The copper alloy comprises 0.15 to 0.95 mass percent of Sn, 0.01 to 0.060 mass percent of P, 0.001 to 0.01 mass percent of B and the balance of copper and other impurities, wherein the impurity content is less than 0.06 mass percent. The longitudinal tensile strength sigmab of the annealed copper alloy pipe is more than or equal to 250 N / mm<2>, the radial average grain is less than or equal to 0.035 millimeter, and a yield ratio of the yield (limit) strength sigma 0.2 of a longitudinal tensile test to sigma b is less than or equal to 0.27. Compared with the copper alloy pipe made of phosphorus deoxidized copper, the tensile strength is improved, grains are refined, the yield strength is not changed obviously, and the corrosion resistance and heat resistance are excellent.

The invention relates to a single-point and double-point switching type BOPET thin film processing device and method, and belongs to the technical field of plastic thin film processing. The single-point and double-point switching type BOPET thin film processing device comprises a pre-heating unit, a stretching unit, a shaping unit, a transverse cutting unit and tension detection units, wherein the stretching unit is used for heating a base film to a stretching temperature and is composed of an air cylinder I, compression rollers I and pre-heating rollers; the temperature range of the pre-heating rollers is 70-140 DEG C; the stretching unit comprises four stretching rollers, a reflection plate and three infrared heaters; the single-point and double-point switching is realized by the matching of the stretching rollers, the reflection plate and the infrared heaters; the transverse cutting unit is arranged under the shaping unit; the tension detection units used for regulating and controlling tension in the stretching process are arranged under the transverse cutting unit. The single-point and double-point switching type BOPET thin film processing device and method are applied to the production of a BOPET thin film and have the advantages of high processing efficiency, complete functions and the like.

A production method of digital inkjet heat transfer printing base paper comprises the following steps: 1, mixing and pulping 10-40% of bleached softwood pulp and 60-90% of bleached hardwood pulp; 2, adding a pulp filler, a degassing agent, a wet strength agent, pulp glue and AKD into the pulp; 3, performing net papermaking on paper pulp, and squeezing to form a paper sheet; 4, predrying the papersheet dewatered by squeezing through a large-diameter drying cylinder of a paper machine; 5, gluing the surface of the paper sheet with surface glue; 6, gluing and drying the paper sheet through a first small-diameter drying cylinder assembly of the paper machine; 7, coating the surface of the paper sheet with coating; 8, coating and drying the surface of the paper sheet with a drying oven; 9, postdrying the paper sheet through a second small-diameter drying cylinder assembly of the paper machine. The digital inkjet heat transfer printing base paper produced by the production method of the digital inkjet heat transfer printing base paper has relatively low transverse expansion and contraction rate, and the distortion of a jetted pattern during heat transfer printing is relatively small.

The invention relates to base paper of thin type packaging paper and a preparation method thereof and belongs to the technical field of the thin type packaging paper used by matching with a punching type carrying belt. The preparation method comprises the following steps: (1) mixing needle-leaf wood pulp with broad-leaf wood pulp, disintegrating, putting into a coarse pulp pool, diluting with water, then pulping, and carrying out defibering and devillicating-brooming treatment on pulp fiber till the beating degree is 35-45 degree SR and the wet weight is 8-12g; (2) adding a pulp dispersing agent, a water-resistant and moisture-proof agent and a wet-strength agent and mixing uniformly; and (3) diluting, putting onto a net, forming, then carrying out pressing, drying, winding, slitting and rewinding on the formed wet paper, and then packaging. The base paper is excellent in following coating, has higher longitudinal tensile strength and lower horizontal shrinkage rate, does not produce powder in slitting, and is not easy to generate fine folds and edge rolling.

The invention provides a quick-mounting type agricultural greenhouse composite structure. The composite structure comprises a fixed base plate, wherein the fixed base plate comprises multiple single plates; each bulged column plate integrated with the corresponding single plate is fixed at each of two ends of the upper surface of the corresponding single plate; a transverse plate is fixedly mounted in first limiting grooves through bolts II; a connecting rod is movably hinged in each second limiting groove through a hinge pin; each arched pipe is fixedly connected with a corresponding sleeve through a bolt III at the inner side end of the bottom surface of the sleeve. The fixed base plate is fixed on the ground through anchor rods, and the bearing capacity and the strength of the whole greenhouse can be greatly improved; the transverse plate is fixedly mounted in the first limiting grooves of first limiting blocks through the bolts II, the longitudinal tensile strength of a greenhouse support can be improved, and the wind resistance of the greenhouse support is improved; the arched pipes are fixed in the sleeves through the bolts III, the situation that the arched pipes shake enormously on strongly windy days can be eliminated, the structure is stable, convenient to mount and free of soldering, and the mounting speed is increased.

The invention discloses a cable with high strength, comprises a plurality of protective cylinders uniformly distributed along a straight line, Between any two adjacent protective cylinder is connectedby a buff mechanism, the outer surfaces of the plurality of protective cylinders are coated with a protective layer, the protective layer is made of elastic material, a plurality of connecting bodiesare uniformly and equally spaced and fixedly connected on the annular cylinder wall in the protective cylinder, A cable body is arranged between two connectors which are optionally located in the same plane and adjacent to each other, The cushioning mechanism comprises a first connecting block and a second connecting block, wherein the cross sections of the first connecting block and the second connecting block are annular, and the first connecting block and the second connecting block are fixedly connected between two adjacent protective cylinders, respectively, and the second connecting block is interposed in the first connecting block. The connecting mechanism and the buffer mechanism consume the pull force of the cable under the harsh environment, thereby improving the tensile strength of the cable as a whole and protecting the cable.

The invention discloses tipping paper containing hydroxyapatite with healthcare antibacterial effect. The tipping paper is prepared from, by weight, 50-65 parts of NBKP, 75-90 parts of bleached hardwood pulp, 10-15 parts of nano-kaolin, 10-15 parts of soluble starch, 2-4 parts of ,polyoxyethylene (60) sorbitan monostearate, 1-2 parts of N,N'-methylene bisacrylamide, 0.5-1 part of ammonium ceric nitrate, 6-12 parts of a Chinese herbal extract, 8-10 parts of rosin size, 20-40 parts of dimethyl sulfoxide, 2-5 parts of pearl powder, 3-5 parts of sodium dihydrogen phosphate, 5-9 parts of calcium nitrate, a proper amount of a 20% NaOH solution, a proper amount of distilled water, a proper amount of cyclohexane and a proper amount of ethyl acetate. Starch is used for wrapping radix glehniae and chrysanthemum morifolium ramat Chinese herbal medicine additives, the slow-release effect is achieved, and the effects that damage caused by smoking can be lower during smoking, and the cigarette smoking taste is improved can be achieved; due to the compound effect of hydroxyapatite and pearl powder, and the healthcare effects of enhancing immunity, supplementing calcium, achieving antisepsis and anti-inflammation and the like are achieved.

The invention discloses a bamboo composite pipe-steel pipe internal-external constraint concrete composite structure. The bamboo composite pipe-steel pipe internal-external constraint concrete composite structure is characterized in that the cross section of the bamboo composite pipe-steel pipe internal-external constraint concrete composite structure is sequentially composed of a bamboo composite pipe (1), sandwich concrete (2) and an inner steel pipe (3) from outside to inside; the bamboo composite pipe (1) sequentially comprises an isolating layer (11), a bamboo fiber strengthened composite layer (12) and an outer protective layer (13) from inside to outside; the bamboo fiber strengthened composite layer (12) is formed by continuously and evenly winding and solidifying one or more layers of bamboo fibers which are impregnated with resin adhesive on the outer wall of the isolating layer (11); the included angle between the fiber direction of the bamboo fibers and the circumferential direction of the bamboo composite pipe (1) ranges from minus 45 degrees to 45 degrees; the outer surface of the bamboo fiber strengthened composite layer (12) is coated with the outer protective layer (13); the inner steel pipe (3) is located in the cross section; the space between the bamboo composite pipe(1) and the inner steel pipe (3) is filled with the sandwich concrete (2); and the inner steel pipe (3) is internally hollow. The structure is high in bearing capacity, good in stiffness, ductility and shock resistance and has good construction performance and durability, the cross section inertia moment is large, concrete consumption is low, and construction cost is low; and the sustainable bamboo source in China is sufficiently utilized, and property advantages good toughness and high longitudinal tension strength of bamboo t are brought into play to the maximum extent.

The invention relates to a preparation technology of a composite material, in particular to a preparation method of a continuous SiC fiber surface C / AIN composite gradient coating. The preparation method comprises the following steps: first step, preparating SiC fibers of a carbon-enriched coating; second step, winding the produced SiC fibers on a sample support and then putting the sample support in a vacuum chamber of a magnetic control sputtering device; third step, rotating the sample support for heating and heat preservation when the vacuum degree of the vacuum chamber is superior to 1.0*10 Pa; fourth step, firstly pumping argon, then pumping nitrogen and fully mixing the gases after the heat preservation; and fifth step, starting a radio-frequency reaction sputtering power supply for sputtering, closing a gas path after the sputtering, keeping the vacuum degree superior to a vacuum degree below 1*10 Pa and cooling the sample support below 40 DEG C. The invention can solve the technical problem of unsatisfied interface complicated requirements by a common coating and can prepare the SiC fibers which have higher strength and stable interface performance with a titanium alloy basal body.

The invention discloses a polyester packaging film having parallel openings and a manufacture method of the polyester packaging film. The film comprises upper and lower surface layers and a core layer. The core layer includes 70-80% of fresh bright polyester slices and 20-30% of recycled slices. Each of the upper and lower surface layers includes 50-60% of fresh bright polyester slices and 40-50% of fresh silicon-containing slices. Conventional technology of a bi-axially-oriented polyester film is greatly improved, so that during tension, molecular chains are oriented in a longitudinal direction as little as possible and oriented in a horizontal direction as much as possible. During fixing, the oriented molecular chains are disoriented in a longitudinal direction as much as possible and kept in horizontal orientation. The studied polyester packaging film having parallel openings and capable of being easily torn in a longitudinal direction can be applied to packaging fields of a medicine, a food and medical equipment.

The invention discloses a preparation method of a proton conduction diaphragm. The preparation method comprises the following steps: (1) mixing boehmite ceramic powder, polymethyl methacrylate, ammonium polyacrylate, polyoxyethylene lauryl ether, carboxyethyl cellulose, bis(2ethylhexyl) hydroxysuccinate sodium sulfonate, disodium octadecyl columbate monoamide sulfonate, polyethyl methacrylate, graphene and water, and performing stirring under a microwave condition to obtain slurry; (2) coating the surface of a polyolefin film with the slurry in a micro-concave roller coating manner to preparea semi-finished diaphragm; (3) adding a coupling agent into water, and adding acid to adjust the pH value, so as to prepare a coupling agent solution; (4) coating the surface of the semi-finished diaphragm with the coupling agent solution in a spraying manner, and then drying the diaphragm to obtain the proton conduction diaphragm. The proton conduction diaphragm prepared by the invention is applied to a fuel cell, is high in efficiency, is not easy to generate fuel permeation, and is long in service life.

The invention discloses high-glossiness tar-reduction tipping paper containing Chinese herbal medicine additives. The high-glossiness tar-reduction tipping paper is prepared from, by weight, 40-60 parts of bleached softwood pulp, 35-50 parts of bleached hardwood pulp, 20-30 parts of aloe, 15-30 parts of soybean protein, 13-17 parts of nano-kaolin, 14-18 parts of soluble starch, 2-4 parts of Tween 60, 1-2 parts of N,N'-methylene bisacrylamide, 0.5-1 part of ammonium ceric nitrate, 8-14 parts of a Chinese herbal medicine extracting solution, 8-10 parts of rosin gum, 25-40 parts of dimethyl sulfoxide, an appropriate amount of distilled water, an appropriate amount of cyclohexane and an appropriate amount of ethyl acetate. According to the high-glossiness tar-reduction tipping paper, the radix glehniae and Hangzhou white chrysanthemum Chinese herbal medicine additives are wrapped by starch, therefore, the slow releasing effect is achieved, and the effects of reducing smoking harm and improving the smoking taste of cigarettes are achieved when the cigarettes are smoked; in addition, the aloe and soybean protein have many good properties such as moisture absorption, breathability and bacterium resistance and can effectively decrease the smoking content of harmful substances such as tar in smoke.

The invention discloses a polyester packaging film having parallel openings and a manufacture method of the polyester packaging film. The film comprises upper and lower surface layers and a core layer. The core layer includes 70-80% of fresh bright polyester slices and 20-30% of recycled slices. Each of the upper and lower surface layers includes 50-60% of fresh bright polyester slices and 40-50% of fresh silicon-containing slices. Conventional technology of a bi-axially-oriented polyester film is greatly improved, so that during tension, molecular chains are oriented in a longitudinal direction as little as possible and oriented in a horizontal direction as much as possible. During fixing, the oriented molecular chains are disoriented in a longitudinal direction as much as possible and kept in horizontal orientation. The studied polyester packaging film having parallel openings and capable of being easily torn in a longitudinal direction can be applied to packaging fields of a medicine, a food and medical equipment.

The invention relates to a light aviation bearing rod piece. The light aviation bearing rod piece comprises two bearing members, two inner liners, a metal shaft sleeve and a tubular covering layer, wherein the two side surfaces of each bearing member are embedded into the two opposite inner liners respectively to form a round tubular pull rod structure; the bearing members and the inner liners are covered with the tubular covering layer; lug piece parts are arranged at the two ends of the bearing members respectively; drop-shaped through holes are formed in the lug piece parts; the metal shaft sleeve is arranged in the through holes; a plurality of annular longitudinal grooves are longitudinally formed in the outer surface of the metal shaft sleeve, and a plurality of transverse grooves which are distributed at equal intervals along the circumference of a round through hole are transversely designed. Compared with the prior art, the light aviation bearing rod piece has the advantages that the producing method is simple and convenient, the bearing capacity is high, and the like.

The present invention discloses a shear transmission belt. A shear connector connected with reinforcement curtain line is embedded in the belt, and integrates with belt material in vulcanization. The present invention can integrate the inside and outside of the transmission belt, transmit employing efficiently inside and outside of the transmission belt, eliminate slippage of inside and outside of the transmission belt to prolong the service life of the transmission belt, has no requirement of belt material and binder, and reduces product cost.

The invention provides a magnesium-aluminum alloy wire hemming type semi-conductive buffer water-blocking tape special for an ultrahigh-voltage cable of 110 KV or above, a semi-conductive water-blocking colloid and a method. The semi-conductive water-resistant colloid comprises ethylene glycol, butyl acrylate, methyl acrylate, conductive carbon black, a dispersing agent and water-absorbent resin. The water-blocking tape comprises fluffy body buffer cotton, coated tin-plated magnesium-aluminum alloy wires and water-blocking layers, the coated tin-plated magnesium-aluminum alloy wires are sewn on the fluffy body buffer cotton, and the water-blocking layers are arranged on the two sides of the fluffy body buffer cotton. According to the invention, the coated tin-plated magnesium-aluminum alloy wires are adopted, so that the semi-conductivity is obviously improved, and the volume resistance is obviously reduced. Besides, the longitudinal tensile strength is improved and reaches more than 110N / cm, which is more than 2.2 times of the tensile strength of the current like products, and the high-speed wrapping production efficiency is improved by more than 50%. The conductive adhesive prepared from ethylene glycol does not contain water, so that the surface of a conductor is not oxidized and corroded; under the same condition, the volatilization speed of alcohol is higher than that of water, so that the energy is saved and the consumption is reduced by more than 40%.

The invention particularly relates to a high-tenacity belt core used for a conveying belt. The belt core comprises an upper woven layer, a middle woven layer, a lower woven layer and side woven layers. The side woven layers comprise side warps and side wefts. The side warps are alternately woven, surrounding the side wefts, between the adjacent two layers. The span of wave peaks and wave troughs of up-down alternate weaving of the side warps is 1-3 side wefts. The number of the side warps is at least two. The side warps are of aramid fibers. The number of strands of the aramid fibers is 6-16,and the degree of twist is 50-70 r / m. The side wefts are plied yarn. The belt core provided by the invention adopts aramid as the stressed yarn of the middle woven layer and the side woven layers, thelongitudinal tensile strength is large, the side abrasion resisting strength is high, the belt core can be used for the conveying belt for high-load and long-distance transportation, and the servicelife is prolonged.

The invention discloses an aroma-increased tipping paper containing a Chinese herbal medicine additive, which is composed of, by weight, 50-65 parts of bleached softwood pulp, 75-90 parts of bleached hardwood pulp, 10-15 parts of nano-kaolin, 10-15 parts of soluble starch, 2-4 parts of Tween 60, 1-2 parts of N,N'-methylene diacrylamide, 0.5-1 part of cerium ammonium nitrate, 6-12 parts of a Chinese herbal medicine extract liquid, 8-10 parts of rosin gum, 20-40 parts of dimethyl sulfoxide, and proper amounts of distilled water, cyclohexane and ethyl acetate. In the invention, the Chinese herbal medicine additive, comprising radix glehniae and chrysanthemum morifolium, is coated by starch, so that a sustained release effect is achieved. The aroma-increased tipping paper can reduce the harm of smoking and improving smoking taste of cigarette during smoking, and also can reduce the symptoms, such as discomfort in throat, cough, excessive phlegm, and the like which are caused by smoking.

The invention relates to the field of aluminum alloy preparation, and discloses a preparation method of a directionally distributed prestressed carbon fiber reinforced aluminum matrix composite. The preparation method of the directionally distributed prestressed carbon fiber reinforced aluminum matrix composite comprises the following steps of (1) applying pretension to carbon fibers arranged in the same direction, and fixing with a mold to obtain directionally arranged carbon fibers; (2) pouring an aqueous solution of a surfactant into the mold, fully infiltrating, and drying to obtain the carbon fibers coated with the surfactant; and (3) pouring molten aluminum into the mold, carrying out ultrasonic oscillation, and then cooling to obtain the carbon fiber reinforced aluminum matrix composite. According to the preparation method provided by the invention, the carbon fibers are coated with the surfactant, so that the compatibility between the carbon fibers and an aluminum matrix can beeffectively improved, and the mechanical property and the heat-conducting property of the composite are improved.

The invention belongs to an overhead wire which takes two or more than two woven fibers as a wire carrying core, in particular to a woven fiber core overhead wire. Presently, the conventional fiber composite core wire adopts a single kind of high strength fiber, has the structure of a wire beam or a wire cable, is formed by soaking in epoxy resin and performing pultrusion and thermocuring forming, and has poor bending performance and impact resisting performance. The invention aims to provide the woven fiber core overhead wire. The woven fiber core overhead wire is characterized in that: a bar-shaped woven fiber core is formed by weaving two or more than two kinds of fibers two-dimensionally or three-dimensionally, and serves as the carrying core of the wire so as to enhance the longitudinal tensile strength of the wire and improve the lateral bending performance and the impact resisting performance of the wire. So, the defects of the conventional fiber composite core wire are overcome.

The invention discloses tipping paper containing Chinese herbal medicine additives and having a flame-retardant effect. The tipping paper is prepared from the following raw materials in parts by weight: 55 to 70 parts of bleached softwood pulp, 70 to 85 parts of bleached hardwood pulp, 12 to 18 parts of nano-kaolin, 15 to 20 parts of soluble starch, 3 to 5 parts of tween 60, 1 to 2 parts of N,N'-methylene bisacrylamide, 0.5 to 1 part of ammonium ceric nitrate, 7 to 10 parts of Chinese herbal medicine extracting solution, 6 to 8 parts of rosin size, 25 to 35 parts of dimethyl sulfoxide, 1 to 3 parts of hydroxymethyl cellulose, 1 to 3 parts of magnesium hydrate, appropriate amount of distilled water, appropriate amount of cyclohexane, and appropriate amount of ethyl acetate. According to the tipping paper containing the Chinese herbal medicine additives and having the flame-retardant effect provided by the invention, Chinese herbal medicine additives such as radix glehniae and chrysanthemum morifolium ramat are wrapped by using starch, the tipping paper has a slow release effect, and the harm of smoking can be reduced and the function of improving cigarette smoking smoke is improved during smoking.

The invention provides a preparation method of a water-resistant oil-resistant anti-falling bamboo fiber environment-friendly meal box. The method comprises the following steps of cutting 3-4-year-oldround bamboo into bamboo tube sections, processing the bamboo tube sections into bamboo bundle fibers, processing or carrying out rotary cutting and drying to obtain a micro-thin bamboo veneer, coating an adhesive on the to-be-glued surface of the micro-thin bamboo veneer, aging, and laminating to pave longitudinal and transverse assemblies; and the assembled thin bamboo veneers are placed in a prefabricated mold located on a high-temperature mold pressing station to be subjected to hot press molding and then laminated, and the water-resistant, oil-resistant and anti-falling bamboo fiber environment-friendly meal box is obtained. The bamboo fiber environment-friendly meal box is uniform in mechanical property and stable in physical property, has water resistance, oil resistance and falling resistance, and is environment-friendly and safe.

The invention discloses an electrodeless composite microporous membrane comprises the following raw materials in parts by mass: 120-160 parts of polypropylene, 1.5-2.6 parts of a nucleating agent, 7-11 parts of trimethylolpropyl trimethacrylate, 0.5-1.2 parts of styrene phenol polyoxyethylene ether ammonium sulfate, 5-8 parts of sodium trimethylsilanolate and 2-4 parts of magnesium ethoxide. The electrodeless composite microporous membrane for the polymer diaphragm provided by the invention has the advantages of continuous production, simple technological process operation, low energy consumption, no environmental pollution and the like, and the longitudinal tensile strength of the prepared electrodeless composite microporous membrane is not lower than 179.6 MPa and is at least 37.4% higher than that of the existing microporous membrane; the technical problem that a microporous membrane prepared in the prior art is poor in longitudinal tensile strength is solved.

The invention discloses a mosaic type outer sheath of an elevator cable. The mosaic type outer sheath is characterized by comprising an organic polymer inner layer (2a), an organic polymer outer layer (2c) and an intermediate reinforcing layer (2b) clamped between the organic polymer inner layer (2a) and the organic polymer outer layer (2c), wherein through holes are distributed on the intermediate reinforcing layer (2b); and the organic polymer inner layer (2a) and the organic polymer outer layer (2c) pass through the through holes (3) to be mutually fused and connected so as to form a three-layer mosaic type outer sheath structure. By adopting the three-layer mosaic type outer sheath structure, the intermediate reinforcing layer, the organic polymer inner layer and the organic polymer outer layer exert the mechanical function in a synergism manner, the cable is prevented from being damaged by various external factors, the mechanical strength and the electrical performances of each inside unit can be ensured and the integrative performance of an elevator system can be favored to improve, thereby providing larger design space for manufacturing a novel elevator.

The invention discloses a method for preparing a synchronously stretched polypropylene high temperature resistant film for wireless charging. The method for preparing the synchronously stretched polypropylene high temperature resistant film for wireless charging includes raw material preparation, extrusion molding, synchronous Stretch, post-stretch treatment. The synchronously stretched polypropylene high-temperature-resistant film used for wireless charging in the present invention uses a synchronously stretched polypropylene film production line, adopts vertical and horizontal synchronous stretching technology, and is compared with an asynchronous stretching production line in which the polypropylene film is stretched longitudinally and then transversely , the polypropylene film produced by the synchronous stretching line has greatly improved the longitudinal tensile strength of the polypropylene film, which can be increased by about 20%, and the mechanical properties, electrical properties, and thickness uniformity of the polypropylene film have been greatly improved and promote.